EP0828265A1 - Stromwandler und Schutzrelais mit einem solchen Wandler - Google Patents

Stromwandler und Schutzrelais mit einem solchen Wandler Download PDF

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Publication number
EP0828265A1
EP0828265A1 EP97410098A EP97410098A EP0828265A1 EP 0828265 A1 EP0828265 A1 EP 0828265A1 EP 97410098 A EP97410098 A EP 97410098A EP 97410098 A EP97410098 A EP 97410098A EP 0828265 A1 EP0828265 A1 EP 0828265A1
Authority
EP
European Patent Office
Prior art keywords
turns
winding
current transformer
secondary winding
output
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP97410098A
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English (en)
French (fr)
Other versions
EP0828265B1 (de
Inventor
Alain Dentella
Robert Tourre
Christian Petit
Pascal Odet
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schneider Electric Industries SAS
Original Assignee
Schneider Electric SE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Schneider Electric SE filed Critical Schneider Electric SE
Publication of EP0828265A1 publication Critical patent/EP0828265A1/de
Application granted granted Critical
Publication of EP0828265B1 publication Critical patent/EP0828265B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20—Instruments transformers
    • H01F38/22—Instruments transformers for single phase ac
    • H01F38/28—Current transformers
    • H01F38/30—Constructions

Definitions

  • the invention relates to a current transformer comprising a magnetic circuit disposed on a primary power conductor and a secondary winding connected to two outputs and having a predetermined number of turns wound on the magnetic circuit determining a transformation ratio.
  • Current transformers used for protective relays, are generally installed on conductors of a power circuit to be protected. They provide electronic circuits for triggering low intensity secondary currents proportional to high primary currents. These secondary currents are used to current measurement, and, if the relays have their own current, for supplying circuits electric and electronic of said relays.
  • the protection relays must operate in very large current ranges. To guarantee precise operation over all current ranges, transformers current have a powerful magnetic circuit that provides a linear response secondary current.
  • the current transformers when the primary current is very high, despite the saturation of the circuit magnetic, the current transformers also provide a very secondary current high even outside normal operating ranges. To prevent currents excessively high secondary levels are applied to the protection relay, limiting devices are inserted between the transformers and the relays.
  • certain current limiting devices include a resistor connected in series between a secondary winding of a current transformer and a relay input.
  • This high power resistor can be installed in the same box than the relay.
  • this arrangement can cause excessive heating of the electronic circuits of the relay when the box is of the closed type or without ventilation.
  • the limiting resistor can be arranged on an additional circuit external to the housing.
  • This arrangement does not cause the electronic circuits to heat up but increases the cost of the protection relay.
  • the object of the invention is a current transformer avoiding the use of resistance limitation arranged on additional circuits and a protection relay comprising a such a transformer.
  • the invention also aims to enable said transformer to have at least two transformation reports.
  • the value of the electrical resistance of the first and second parts of the secondary winding connected in series is greater than five ohms.
  • the first number of turns is greater than three hundred.
  • a first transformation ratio is determined between the first output and the second output by the difference between the first number of turns of the first part and the second number of turns of the second part
  • a second transformation ratio is determined between the first output and the third output by the difference between the sum of the first and third number of turns of the first and third parts and the second number of turns of the second part.
  • the first number of turns in the first part can be greater or less than the second number of turns in the second part.
  • the value of the resistance of the secondary winding is greater than eight ohms between the first output and the second output and greater than twelve ohms between the first exit and third exit.
  • a processing unit comprises at least two inputs connected by two electrical conductors at two outputs of the secondary winding.
  • the processing unit can be inserted in a closed box.
  • the known protection relay shown in Figure 1 includes a transformer current 1 crossed by a primary conductor 2, a resistor 3 and a processing unit 4.
  • a secondary winding 5 wound on a magnetic circuit 6 of the transformer is connected, in series with resistor 3 to two inputs of the processing unit.
  • Resistor 3 is arranged on a circuit 7 separate from the processing unit. This resistance secondary current limit Is when a primary current Ip is very high. She permits thus protecting the electronic circuits of the processing unit.
  • the transformer has a RT transformation ratio predetermined by a number of turns N5 of the secondary winding. Since the primary has only one pass, RT is equal to NS.
  • the winding secondary has a first number of turns wound in a first direction winding and a second number of turns wound in a second winding direction opposite to the first winding direction.
  • the number of turns representative of the difference between the first number and the second number of turns is equivalent to the number of turns NS to determine the transformation ratio.
  • the second number of turns, wound in a direction opposite to the first has the effect of increasing the number of turns of the secondary winding without modify the number of turns concerning the transformation ratio.
  • the second number of turns wound in the opposite direction cancels an equivalent number of turns wound in the first sense.
  • the total increase in the number of turns is intended to increase in the same proportions the total resistance of the secondary winding.
  • the value of the resistance of the secondary winding is increased without decreasing the cross-section of the wire of said winding. This increase in the value of the winding resistance secondary is used to replace the resistor 3 in series with the transformer current and the processing unit.
  • Resistance 3 limitation is achieved by the resistance of the son of all the turns of the secondary winding.
  • the processing unit 4 is directly connected to the secondary winding without additional circuit comprising a resistance of high power limitation.
  • the transformer of current provides a secondary current Is substantially proportional to the primary current Ip flowing in the primary conductor 2 if said primary current is within a range of predetermined operation, or a secondary current attenuated by saturation of the circuit magnetic due to resistance if the primary current is greater than a maximum value of the operating range.
  • FIG. 2 shows a diagram of a protection relay comprising a transformer 8 according to one embodiment of the invention.
  • the secondary winding 5 comprises a first part 5a comprising a first number N1 of turns wound in a first direction and a second part 5b comprising a second number N2 of turns wound in a second direction opposite to the first direction.
  • the first and second parts are connected in series and connected between a first output S1 and a second output S2.
  • the processing unit 4 is connected directly to the first and second outputs S1 and S2 without additional limiting resistance.
  • the transformation ratio of transformer 8 depends on the difference between the first number N1 of turns and the second number N2 of turns. If the primary conductor has only one passage in the transformer, the transformation ratio RT is equal to N1 - N2.
  • the second part 5b comprising a second number N2 of turns wound in the opposite direction of the first, cancels the effects of induction on an equivalent number of turns of the first part 5a.
  • the first part 5a has a first number N1 of turns equivalent to the sum of a number of turns necessary to determine the RT transformation ratio and a number of turns additional equal to the number N2 of turns of the second part 5b.
  • the turns additional of the first part 5a and the turns of the second part 5b are intended to increase the series resistance of the winding and avoid the use of external resistors additional.
  • the total resistance of the winding comprising the first and second parts 5a and 5b connected in series is preferably greater than 5 ohms.
  • the secondary winding has three outputs.
  • the current transformers with three outputs are used to have at least two different transformation ratios depending on the outputs connected to the treatment.
  • the transformer shown in Figure 3 has a first, a second and third outputs respectively S1, S2 and S3 connected to the winding secondary.
  • the secondary winding comprises a first part 5a comprising a first number N1 of turns wound in a first winding direction and a second part 5b comprising a second number N2 of turns wound in a second winding direction opposite to the first.
  • the second part is connected in series with the first one.
  • the secondary winding has a third part 5c comprising a third number N3 of turns wound in the same direction as the turns of the first part 5a.
  • the transformation ratio depends on the difference in the number of turns between the first part 5a and the second part 5b. For example, if the primary has only one pass, a first ratio of transformation RT1 is equal to
  • the limiting resistance is equal to the sum of the resistances of the turns of the first 5a and the second part 5th.
  • a second ratio of RT2 transformation depends on the difference between the sum (N1 + N3) of the number of turns of the first part 5a and of the third part 5c and the number N2 of turns of the second part 5th. If the primary has only one pass, the transformation ratio RT2 is equal to
  • the limiting resistance is equal to the sum of the resistances of the turns of all of the first, second and third parts. Its value is preferably greater than 12 ohms.
  • the transformation ratios RT1 and RT2 can be, for example, 200 respectively between the outputs S1 and S2 and 500 between the outputs S1 and S3.
  • N1 is greater than N2.
  • the winding resistance is approximately 10 ⁇ between S1 and S2 and approximately 14 ⁇ between S1 and S3.
  • N1 400 turns
  • N2 600 turns
  • N3 700 turns.
  • N2 is greater than N1.
  • the total number of turns between S1 and S2 or between S1 and S3 and therefore the values of the limiting resistance are greater than those of the first embodiment.
  • the resistance of the winding is greater than 10 ⁇ between S1 and S2 and greater than 20 ⁇ between S1 and S3.
  • FIG. 4 shows an embodiment of the transformer 15.
  • the magnetic circuit 6 a a toroidal shape and the three parts 5a, 5b and 5c of the secondary winding are each distributed over the entire torus.
  • FIG. 5 represents a diagram of a protection relay according to an embodiment of the invention.
  • the protection relay comprises three current transformers 9a, 9b and 9c arranged on three conductors of a network to be protected, 2a, 2b and 2c respectively.
  • the secondary winding of each transformer has a first number N1 of turns wound in a first direction and a second number N2 of turns wound in a second direction opposite to the first. The difference between the first N1 and the second N2 number of turns determines the transformation ratio.
  • the limiting resistance of each transformer is made up of the resistance of all the turns of each secondary winding.
  • the secondary windings of transformers 9a, 9b and 9c are connected to inputs rectifiers 10a, 10b and 10c respectively.
  • the rectifier outputs are connected to a processing unit 4.
  • Outputs of the processing unit are connected to a relay 11 for controlling the opening of main contacts 12 arranged in series with the conductors 2a, 2b and 2c of the network to be protected.
  • the processing unit 4 and the rectifiers 10a, 10b, and 10c are arranged on a trigger circuit located inside a closed housing 14.
  • the limiting resistances are achieved by the resistance of the secondary windings of the current transformers, in particular by additional turns.
  • the transformation ratios RT, RT1 and RT2 expressed above correspond to the current Ip of the primary conductor 2 with respect to the current Is flowing in the winding secondary. These ratios are theoretical values which do not take account of losses in the magnetic circuit nor the load conditions of the secondary winding. If the number of passages of the primary conductor in the magnetic circuit is greater than one, the transformation ratios will then be inversely proportional to the numbers of passages.
  • the various parts of the secondary windings can be produced in a single operation, for example by reversing the direction of winding during manufacture for the turns of the second part 5b wound in the opposite direction. It is also possible to wind each part independently and then connect the parts according to the direction predetermined winding of their turns.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Emergency Protection Circuit Devices (AREA)
EP19970410098 1996-09-05 1997-09-01 Stromwandler und Schutzrelais mit einem solchen Wandler Expired - Lifetime EP0828265B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9611041A FR2752996B1 (fr) 1996-09-05 1996-09-05 Transformateur de courant et relais de protection comportant un tel transformateur
FR9611041 1996-09-05

Publications (2)

Publication Number Publication Date
EP0828265A1 true EP0828265A1 (de) 1998-03-11
EP0828265B1 EP0828265B1 (de) 2002-11-13

Family

ID=9495619

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19970410098 Expired - Lifetime EP0828265B1 (de) 1996-09-05 1997-09-01 Stromwandler und Schutzrelais mit einem solchen Wandler

Country Status (4)

Country Link
EP (1) EP0828265B1 (de)
DE (1) DE69717033T2 (de)
ES (1) ES2184976T3 (de)
FR (1) FR2752996B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998058267A1 (de) * 1997-06-16 1998-12-23 Trench Switzerland Ag Ringkern-stromwandler mit integriertem messshunt
EP2980941A1 (de) * 2014-08-01 2016-02-03 Schneider Electric Industries SAS Vorrichtung zum anpassen eines elektrischen stromversorgungssignals, entsprechendes stromversorgungssystem und verfahren zur anpassung des stromversorgungssignals

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3260976A (en) * 1964-06-30 1966-07-12 Gen Electric Current transformer
FR2512264A1 (fr) * 1981-08-26 1983-03-04 Merlin Gerin Capteur de courant hybride compense
EP0092653A1 (de) * 1982-04-22 1983-11-02 LGZ LANDIS & GYR ZUG AG Messwandler für Messgeräte
JPS60103607A (ja) * 1983-11-10 1985-06-07 Hitachi Ltd 地絡電流検出装置
JPH07235427A (ja) * 1994-02-21 1995-09-05 Shirogane Seisakusho:Kk 昇圧トランスおよびその巻線方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3260976A (en) * 1964-06-30 1966-07-12 Gen Electric Current transformer
FR2512264A1 (fr) * 1981-08-26 1983-03-04 Merlin Gerin Capteur de courant hybride compense
EP0092653A1 (de) * 1982-04-22 1983-11-02 LGZ LANDIS & GYR ZUG AG Messwandler für Messgeräte
JPS60103607A (ja) * 1983-11-10 1985-06-07 Hitachi Ltd 地絡電流検出装置
JPH07235427A (ja) * 1994-02-21 1995-09-05 Shirogane Seisakusho:Kk 昇圧トランスおよびその巻線方法

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 009, no. 255 (E - 349) 12 October 1985 (1985-10-12) *
PATENT ABSTRACTS OF JAPAN vol. 096, no. 001 31 January 1996 (1996-01-31) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998058267A1 (de) * 1997-06-16 1998-12-23 Trench Switzerland Ag Ringkern-stromwandler mit integriertem messshunt
EP2980941A1 (de) * 2014-08-01 2016-02-03 Schneider Electric Industries SAS Vorrichtung zum anpassen eines elektrischen stromversorgungssignals, entsprechendes stromversorgungssystem und verfahren zur anpassung des stromversorgungssignals
FR3024601A1 (fr) * 2014-08-01 2016-02-05 Schneider Electric Ind Sas Dispositif d'adaptation d'un signal d'alimentation electrique, systeme d'alimentation electrique et procede d'adaptation d'un signal d'alimentation electrique associes
CN105322573A (zh) * 2014-08-01 2016-02-10 施耐德电器工业公司 匹配电力供应信号的关联设备、方法、以及电力供应系统
CN105322573B (zh) * 2014-08-01 2019-04-05 施耐德电器工业公司 匹配电力供应信号的关联设备、方法、以及电力供应系统

Also Published As

Publication number Publication date
FR2752996B1 (fr) 1998-10-02
DE69717033T2 (de) 2003-07-10
EP0828265B1 (de) 2002-11-13
FR2752996A1 (fr) 1998-03-06
ES2184976T3 (es) 2003-04-16
DE69717033D1 (de) 2002-12-19

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